Lists wrote: > On 10/24/2013 03:48 PM, Karanbir Singh wrote: >> On 10/23/2013 10:30 AM, Morgan Cox wrote: >>> If you want SSD + MDRAID you need to use a 3.8+ kernel to have TRIM. >>> >>> The speed difference between the stock 2.6.32 -> 3.10 kernel with SSD + >>> MDRAID is insane. >> has someone quantified what this 'insane' amounts to ? > > Going from HDD to SSD's gave us better than a 95% reduction in query > times for complex queries using PostgreSQL on otherwise identical > hardware. I wouldn't have believed it had I not seen it directly, for > myself. interesting datapoint for HDD vs SSD, but what about kernel versions? When using SSDs, did you need to use 3.8+ kernels as suggested in the quoted post, or do you use stock? thanks _______________________________________________ CentOS mailing list CentOS@xxxxxxxxxx http://lists.centos.org/mailman/listinfo/centos